[vtk-developers] TestFixedPointRayCasterLinearCropped failure

David Gobbi david.gobbi at gmail.com
Sun Feb 24 13:38:44 EST 2013


I see the failure on my MacBook Pro when I add the following
lines to the top of the test:

  vtkMultiThreader multithread
  multithread SetGlobalDefaultNumberOfThreads 64

The lines have to be added to the top (i.e. before the mappers
are instantiated) in order to take effect.

 - David

On Sun, Feb 24, 2013 at 11:25 AM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> I can't get to to fail on my fedora system. I get a 0 error no matter how
> many threads I specify. I'll try a couple of other systems I have access to.
>
>
> On Sun, Feb 24, 2013 at 1:17 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>>
>> I haven't been able to find the old mailing list discussions about
>> this topic, but here is the original bug report that I made in 2011
>> when I noticed the failing regression test.  It gives instructions
>> that any developer can use to reproduce the bug.
>> http://www.vtk.org/Bug/view.php?id=12115
>>
>> A more recent report from a user who saw the same bug.
>> http://www.vtk.org/Bug/view.php?id=13420
>>
>> I've already fixed a few issues in this volume mapper related to
>> 32-bit overflow, but this threading bug should probably get the
>> attention of someone who is more familiar with the code.
>>
>>  - David
>>
>>
>> On Sun, Feb 24, 2013 at 10:34 AM, David Gobbi <david.gobbi at gmail.com>
>> wrote:
>> > Bill,
>> >
>> > I can reproduce the failure on any computer by increasing the
>> > DefaultNumberOfThreads in the multithreader.
>> >
>> > Also, this is the "fixed point" mapper, it uses integer arithmetic.
>> > It should produce _identical_ results on all platforms.
>> >
>> > I'll see if I can dig up some of my earlier list postings on it.  I've
>> > spent many hours investigating this issue, both by myself and with
>> > other VTK users.
>> >
>> >  - David
>> >
>> > On Sun, Feb 24, 2013 at 9:57 AM, Bill Lorensen <bill.lorensen at gmail.com>
>> > wrote:
>> >> David,
>> >>
>> >> What makes you think this is a threading issue? The failng error is
>> >> pretty
>> >> low, <20 on all failing systems and the images look visually similar.
>> >> http://open.cdash.org/testDetails.php?test=178462199&build=2824975
>> >>
>> >> Bill
>> >>
>> >> --
>> >> Unpaid intern in BillsBasement at noware dot com
>
>
>
>
> --
> Unpaid intern in BillsBasement at noware dot com



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